Officials with the Port of Houston say they are unsure if anyone was injured at this time.
We are told the train cars were carrying grain. There are no reports of any damage or a leak at this time.
Fire crews with the Port of Houston remain on standby and Union Pacific is sending a hazmat crew to inspect the site, according to a Port of Houston spokesperson.
A crew from BNSF was also at the scene.
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Christian Terry covered digital news in Tyler and Wichita Falls before returning to the Houston area where he grew up. He is passionate about weather and the outdoors and often spends his days off on the water fishing.